Semax vs Selank: Comparing the Two Research Nootropics
Semax and selank are both Russian-developed research nootropic peptides, but they are studied for different primary effects: semax is an ACTH(4-10) fragment researched for neuroprotection and BDNF upregulation (cognition, focus), while selank is a heptapeptide researched for anxiolytic (anti-anxiety) and calming effects via GABAergic and serotonergic modulation.
Semax and selank are often mentioned together as the two flagship research nootropic peptides. They share Russian pharmaceutical origins but are studied for largely opposite ends of the cognitive spectrum.
What is the difference between semax and selank?
Semax is a synthetic fragment of ACTH(4-10), studied for neuroprotection, BDNF and NGF upregulation, and dopaminergic activity — associated with cognition and focus research. Selank is a synthetic heptapeptide studied for anxiolytic effects through GABAergic and serotonergic modulation — associated with anxiety-reduction and calming research.
Side-by-side comparison
| Semax | Selank | |
|---|---|---|
| Origin | ACTH(4-10) fragment | Tuftsin-derived heptapeptide |
| Primary research focus | Neuroprotection, cognition, BDNF | Anxiolytic, calming |
| General profile | Stimulating / cognitive | Calming / anti-anxiety |
| Developer origin | Russia | Russia |
Are they studied together?
Because their profiles are complementary — one cognitive-leaning, one calming-leaning — they are sometimes researched in combination in nootropic studies.
Key takeaways
- Semax: ACTH(4-10) fragment; neuroprotection, BDNF, cognition/focus research.
- Selank: anxiolytic heptapeptide; anti-anxiety and calming research.
- Semax leans stimulating/cognitive; selank leans calming/anxiolytic.
- Both are Russian-developed peptides studied in cognitive research.